<template>
  <view v-if="goods_info.goods_name">
    <swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000" :circular="true">
      <swiper-item v-for="(item ,i) in goods_info.pics" :key="i">
        <image :src="item.pics_big" @click="preview(i)"></image>
      </swiper-item>
    </swiper>
    <!-- 商品详细信息-->
    <view class="goods-info-box">
      <view class="price">￥{{goods_info.goods_price}}</view>
      <view class="goods-info-body">
        <view class="goods-name">{{goods_info.goods_name}}</view>
        <view class="favi">
          <uni-icons type="star" size="18" color="gray"></uni-icons>
          <text>收藏</text>
        </view>
      </view>
      <view class="yf">快递: 免运费 -- {{cart.length}}</view>
    </view>

    <!-- 商品详情信息用rich-text组件渲染，后端发来的是html字串 -->
    <rich-text :nodes="goods_info.goods_introduce"></rich-text>

    <!-- 商品导航组件 -->
    <view class="goods_nav">
      <!-- fill 控制右侧按钮的样式 -->
      <!-- options 左侧按钮的配置项 -->
      <!-- buttonGroup 右侧按钮的配置项 -->
      <!-- click 左侧按钮的点击事件处理函数 -->
      <!-- buttonClick 右侧按钮的点击事件处理函数 -->
      <uni-goods-nav :fill="true" :options="options" :buttonGroup="buttonGroup" @click="leftClick"
        @buttonClick="rightClick" />
    </view>
  </view>
</template>

<script>
  import {
    mapState
  } from "vuex"
  import {mapMutations} from 'vuex'
  import {mapGetters} from 'vuex'
  export default {
    data() {
      return {
        goods_info: {},
        // 底部导航栏左侧按钮的配置对象
        options: [{
          icon: 'shop',
          text: "店铺"
        }, {
          icon: 'cart',
          text: "购物车",
          info: 2
        }],
        // 底部导航栏右侧按钮的配置对象
        buttonGroup: [{
          backgroundColor: '#f00',
          text: '加入购物车',
          color: '#fff'
        }, {
          backgroundColor: '#ffa200',
          text: '立即购买',
          color: '#fff'
        }],
      };
    },
    onLoad(options) {
      const goods_id = options.goods_id;
      this.getGoodsDetail(goods_id);
    },
    onReachBottom() {
      uni.$showMsg("我可是有底线的~");
    },
    computed: {
      ...mapState('m_cart', ['cart']), // 解构总体数据
      ...mapGetters('m_cart', ['total']) // 解构获取总量函数
    },
    methods: {
      // 获取商品详细信息
      async getGoodsDetail(goods_id) {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/goods/detail', {
          goods_id
        });
        if (res.meta.status !== 200) return uni.$showMsg();
        this.goods_info = res.message;
        this.goods_info.goods_introduce = this.goods_info.goods_introduce.replace(/<img/g,
          '<img style="display: block;"').replace(/webp/g, "jpg");
      },
      // 点击预览图片
      preview(i) {
        uni.previewImage({
          current: i,
          urls: this.goods_info.pics.map(x => x.pics_big)
        })
      },
      leftClick(e) {
        if (e.content.text == "购物车") {
          uni.switchTab({
            url: "/pages/cart/cart"
          })
        }
      },
      rightClick(e) {
        if(e.content.text === "加入购物车"){
          const goods = {
            goods_id: this.goods_info.goods_id, // 商品的Id
            goods_name: this.goods_info.goods_name, // 商品的名称
            goods_price: this.goods_info.goods_price, // 商品的价格
            goods_count: 1, // 商品的数量
            goods_small_logo: this.goods_info.goods_small_logo, // 商品的图片
            goods_state: true // 商品的勾选状态
          }
          this.addToCart(goods);
        }
      },
      ...mapMutations('m_cart', ['addToCart']),    
      },
      watch: {
        // 深度监听，页面即使没有出现也会调用
        total: {
          handler(newval){
            const findResult = this.options.find( x => x.text === '购物车');
            if(findResult) {
              findResult.info = newval;
            }
          },
          immediate: true 
        }
      }
  }
  
</script>

<style lang="scss">
  swiper {
    height: 750rpx;

    image {
      width: 100%;
      height: 100%;
    }
  }

  .goods-info-box {
    padding: 10px;
    padding-right: 0;

    .price {
      color: #c00000;
      font-size: 18px;
      margin: 10px 0;
    }

    .goods-info-body {
      display: flex;
      justify-content: space-between;

      .goods-name {
        font-size: 13px;
        padding-right: 10px;
      }

      // 收藏区域
      .favi {
        width: 120px;
        font-size: 12px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        border-left: 1px solid #efefef;
        color: gray;
      }
    }

    // 运费
    .yf {
      margin: 10px 0;
      font-size: 12px;
      color: gray;
    }
  }

  .goods-detail-container {
    // 给页面外层的容器，添加 50px 的内padding，
    // 防止页面内容被底部的商品导航组件遮盖
    padding-bottom: 50px;
  }

  .goods_nav {
    // 为商品导航组件添加固定定位
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
  }
</style>
